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ROI Assertion Error

asked 2013-02-05 15:25:29 -0500

Possede gravatar image

updated 2013-02-05 22:52:22 -0500

Three webcams are used to capture three images which overlap as shown here: http://i1276.photobucket.com/albums/y475/sesj13/ROI_zpsffce8c7d.png

I am trying to reduce the ROIs to just the overlapped regions (1/4 of the width of each image), but having problems. My code and the associated error is shown here: http://i1276.photobucket.com/albums/y475/sesj13/ROIError_zpsede8e7d3.jpg

I am trying this (which I believe is correct), but to no avail:

img_roi0 = img_grey0(Rect((WIDTH-(WIDTH/4)), 0, WIDTH, HEIGHT));

img_roi1 = img_grey1(Rect(0, 0, (WIDTH/4), HEIGHT));

img_roi2 = img_grey1(Rect((WIDTH-(WIDTH/4)), 0, WIDTH, HEIGHT));

img_roi3 = img_grey2(Rect(0, 0, (WIDTH/4), HEIGHT));

Any input would be appreciated!

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answered 2013-02-05 22:34:49 -0500

Daniil Osokin gravatar image

Hi! According to the Rect documentation, 3rd and 4th parameters are width and height of the resulting rectangle, not the image, so your code should be like this:

img_roi0 = img_grey0(Rect((WIDTH-(WIDTH/4)), 0, WIDTH/4, HEIGHT));
img_roi1 = img_grey1(Rect(0, 0, (WIDTH/4), HEIGHT));
img_roi2 = img_grey1(Rect((WIDTH-(WIDTH/4)), 0, WIDTH/4, HEIGHT));
img_roi3 = img_grey2(Rect(0, 0, (WIDTH/4), HEIGHT));
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Thank you very much, I was being a plonker!

Possede gravatar imagePossede ( 2013-02-06 10:23:46 -0500 )edit

You are welcome.

Daniil Osokin gravatar imageDaniil Osokin ( 2013-02-07 00:30:23 -0500 )edit
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Asked: 2013-02-05 15:25:29 -0500

Seen: 123 times

Last updated: Feb 05 '13